The effect of impurity on the thermal entanglement in three-qutrit spin-1 Heisenberg XXX chain

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The effect of impurity on the thermal entanglement in three-qutrit spin-1 Heisenberg XXX chain

Qin Meng , Tian Dong-Ping , Tao Ying-Juan

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The effect of impurity on the thermal entanglement in three-qutrit spin-1 Heisenberg XXX chain

Qin Meng, Tian Dong-Ping, Tao Ying-Juan

Acta Phys. Sin., 2008, 57(9): 5395-5399.

doi: 10.7498/aps.57.5395

Abstract
We investigate the impurity entanglement of 3-qutrit XXX-type Heisenberg chains in the presence of a uniform magnetic field along z axis by means of negativity. The entanglement is calculated as a function of the coupling constants J, impurity parameter J1, magnetic fields B and temperature T. Through calculating the negativity between sites 1 and (2,3) N1-23 and sites 3 and (1,2) N12-3, we show that the critical temperature Tc above which the entanglement vanishes increases with the increase of J1. The existence of magnetic fields B can obviously reduce the entanglement, and it is found that the limiting temperature Tc depends on the impurity parameter J1 but not on the magnetic field.

Keywords:
thermal entanglement /

Heisenberg XXX chain /

impurity
Authors and contacts
Qin Meng¹,

Tian Dong-Ping³,

Tao Ying-Juan²

(1)解放军理工大学理学院，南京 211101；西安交通大学理学院，西安 710049; (2)西安交通大学理学院，西安 710049; (3)西安邮电学院，西安 710061
References

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Vol. 57, Issue 9 - 2008-05-05

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